Who will ask for answers in question-and-answer software now? We all use software to' interact with homework' and' help with homework'. Just enter the book line code. Your adoption is my motivation. Remember to praise and adopt. It's not easy to answer questions. Help each other. Friends who ask questions on mobile phones can just comment (satisfied) in the upper right corner of the client. If you agree with my answer, please click the (adopt as satisfactory answer) button in time! !